WANGQiao,LIXue-yi,CHENBei-yang,et al.Influence of Sludge Composition on Co-incineration Disposal in Coal?fired Power Plant and Its Slagging Characteristics[J].China Water & Wastewater,2025,41(12):33-40.
燃煤电厂协同焚烧处置污泥成分影响及结渣特性
- Title:
- Influence of Sludge Composition on Co-incineration Disposal in Coal?fired Power Plant and Its Slagging Characteristics
- Keywords:
- municipal sludge; co-incineration; coal-fired power plant; dewatering conditioner; slagging characteristics
- 摘要:
- 针对污泥是否造成电厂燃煤锅炉结焦的问题，调研了若干市政污泥协同焚烧项目，并通过非金属元素含量检测、灰熔融性和灰氧化物成分分析等，考察了污泥成分对燃煤锅炉可能产生的影响，从而提出污泥脱水调理剂的选择依据。结果表明，协同焚烧处置的污泥在脱水时不宜使用含氯类或含硫类调理剂，尤其是FeCl3或Fe2（SO4）3；若必须添加含氯类或含硫类调理剂，污泥氯含量应不高于干基的1.57%或硫含量不高于干基的3.11%；相反，石灰可适量投加，但应控制污泥中的铁钙比例，避免铁钙比接近于1而出现协同结渣现象。综合判别指数（结渣特性指数）计算结果表明，9个污泥样品中有4个为中等结渣，1个为中等偏严重结渣，剩余4个为严重结渣；针对预测为严重结渣的污泥，电厂应尽量降低污泥掺烧比例并提高锅炉结焦检修频率。
- Abstract:
- Aiming at whether sludge causes coking of coal-fired boilers in power plants, several municipal sludge co-incineration projects were investigated. The potential effects of sludge composition on coal-fired boilers were analyzed through non-metallic element contents detection, analysis of ash fusibility, and ash oxide composition. Based on the findings, criteria for selecting appropriate sludge conditioning agents were proposed. Results turned out that chlorine-based or sulfur-based conditioners, particularly FeCl3 or Fe2(SO4)3, are inappropriate for dewatering of sludge intended for co-incineration disposal in coal-fired power plant. If the chlorinated or sulfurous conditions were inevitable, the chlorine content should not exceed 1.57% of DS or the sulfur content should not exceed 3.11% of DS. On the contrary, a certain amount of lime can be added, but the proportion of iron and calcium in the sludge should be controlled to avoid synergistic slagging, especially when the ratio was close to 1. The results of comprehensive discriminant index (coal slagging index) showed that four of the nine sludge samples exhibited moderate slagging, one exhibited moderate to severe slagging, and the remaining four exhibited severe slagging. For sludge predicted to cause severe slagging, the power plant should reduce the proportion of sludge co-incineration ratio and increase the frequency of boiler coking maintenance.
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